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grpclb: fix a bug in handling server address updates. 

It didn't check if the address was already there in the current
subchannel set before creating a new subchannel for it, causing a leak
of subchannels.
This commit is contained in:
Kun Zhang 2017-02-25 14:12:17 -08:00 committed by Kun Zhang
parent e345273268
commit 2fab8895dc
2 changed files with 30 additions and 15 deletions
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17
grpclb/src/main/java/io/grpc/grpclb/GrpclbLoadBalancer.java
View File

@ -356,13 +356,16 @@ class GrpclbLoadBalancer extends LoadBalancer implements WithLogId {
EquivalentAddressGroup eag = new EquivalentAddressGroup(address);
// TODO(zhangkun83): save the LB token and insert it to the application RPCs' headers.
if (!newSubchannelMap.containsKey(eag)) {
Attributes subchannelAttrs = Attributes.newBuilder()
.set(STATE_INFO,
new AtomicReference<ConnectivityStateInfo>(
ConnectivityStateInfo.forNonError(IDLE)))
.build();
Subchannel subchannel = helper.createSubchannel(eag, subchannelAttrs);
subchannel.requestConnection();
Subchannel subchannel = subchannels.get(eag);
if (subchannel == null) {
Attributes subchannelAttrs = Attributes.newBuilder()
.set(STATE_INFO,
new AtomicReference<ConnectivityStateInfo>(
ConnectivityStateInfo.forNonError(IDLE)))
.build();
subchannel = helper.createSubchannel(eag, subchannelAttrs);
subchannel.requestConnection();
}
newSubchannelMap.put(eag, subchannel);
}
newRoundRobinList.add(eag);

28
grpclb/src/test/java/io/grpc/grpclb/GrpclbLoadBalancerTest.java
View File

@ -601,15 +601,20 @@ public class GrpclbLoadBalancerTest {
assertSame(error1, picker6.result.getStatus());
// Update backends, with a drop entry
List<InetSocketAddress> backends2 = Arrays.asList(
new InetSocketAddress("127.0.0.1", 2030), null);
List<InetSocketAddress> backends2 =
Arrays.asList(
new InetSocketAddress("127.0.0.1", 2030), // New address
null, // drop
new InetSocketAddress("127.0.0.1", 2010), // Existing address
new InetSocketAddress("127.0.0.1", 2030)); // New address appearing second time
verify(subchannel1, never()).shutdown();
verify(subchannel2, never()).shutdown();
lbResponseObserver.onNext(buildLbResponse(backends2));
verify(subchannel1).shutdown();
verify(subchannel2).shutdown();
verify(subchannel1).shutdown(); // not in backends2, closed
verify(subchannel2, never()).shutdown(); // backends2[2], will be kept
inOrder.verify(helper, never()).createSubchannel(
eq(new EquivalentAddressGroup(backends2.get(2))), any(Attributes.class));
inOrder.verify(helper).createSubchannel(
eq(new EquivalentAddressGroup(backends2.get(0))), any(Attributes.class));
assertEquals(1, mockSubchannels.size());
@ -620,16 +625,23 @@ public class GrpclbLoadBalancerTest {
RoundRobinPicker picker7 = (RoundRobinPicker) pickerCaptor.getValue();
assertRoundRobinList(picker7, (Subchannel) null);
// State updates on obsolete subchannels will have no effect
// State updates on obsolete subchannel1 will have no effect
deliverSubchannelState(subchannel1, ConnectivityStateInfo.forNonError(READY));
deliverSubchannelState(
subchannel1, ConnectivityStateInfo.forTransientFailure(Status.UNAVAILABLE));
deliverSubchannelState(subchannel1, ConnectivityStateInfo.forNonError(SHUTDOWN));
deliverSubchannelState(subchannel2, ConnectivityStateInfo.forNonError(SHUTDOWN));
inOrder.verifyNoMoreInteractions();
deliverSubchannelState(subchannel3, ConnectivityStateInfo.forNonError(READY));
inOrder.verify(helper).updatePicker(pickerCaptor.capture());
RoundRobinPicker picker8 = (RoundRobinPicker) pickerCaptor.getValue();
assertRoundRobinList(picker8, subchannel3, null);
// subchannel2 is still IDLE, thus not in the active list
assertRoundRobinList(picker8, subchannel3, null, subchannel3);
// subchannel2 becomes READY and makes it into the list
deliverSubchannelState(subchannel2, ConnectivityStateInfo.forNonError(READY));
inOrder.verify(helper).updatePicker(pickerCaptor.capture());
RoundRobinPicker picker9 = (RoundRobinPicker) pickerCaptor.getValue();
assertRoundRobinList(picker9, subchannel3, null, subchannel2, subchannel3);
verify(subchannel3, never()).shutdown();
assertFalse(oobChannel.isShutdown());